小波变换在液氮制冷式露点自动检测中的应用

采用小波变换的Ｍａｌｌａｔ算法,求取智能露点仪温度曲线的拐点,这种算法的显著特点是可于背景噪音中很好地提取用用信号,在３－５次测量中,即可得到重复性极好的曲线拐点值,与传统的最小二乘拟合建模方法相比,不但可以减少测量次数,而且使露点温度值的自动检测达到了更高的准确性和稳定性。     

热管式酸露点仪的实验研究

提出一种测量烟气酸露点温度的新方法，研制成功一种抗污染性能好、可用于燃煤锅炉烟气露点测量的仪器。     

酸灰耦合机制对烟道换热管传热特性的影响试验

为实现对酸露点的准确预测,设计并搭建了一套针对锅炉尾部烟道烟气酸露点测量系统;并在某电厂1 000 MW空预器出口烟道进行就地测量。结果表明:在同一工况下,随着试验温度降低,换热管努赛尔数下降,管壁及腐蚀片积灰与腐蚀程度逐渐加深。进而将所测得的工程酸露点与在同一煤种下利用已有经验公式所得的酸露点进行对比分析。由于存在积灰对酸液的耦合作用,工程酸露点通常比热力学酸露点低约40℃,能够较好地反映工程实际烟气运行情况,对深度余热利用系统的设计和运行有一定的理论指导意义。     

烟气余热回收技术在电厂中的应用

介绍了电厂烟气余热回收利用技术,酸露点的计算方法.利用烟气余热加热除盐水,把锅炉尾部烟气温度降低到接近酸露点,最大程度的提高锅炉效率,降低煤耗,增加发电量,降低CO.与SO2排放以达到节能与环保目的.     

直流—交流变换器提高带载能力的方法

通过研究机载露点仪直流－交流变换器的原理，并对其带载特性进行分析，给出提高带载能力的方法，最后给出实验结果。     

锅炉尾部受热面低温腐蚀原因分析及防止措施

热电联合车间有三台中压炉,三台高压炉。运行几年后出现最突出的问题是送风机电流增大,尽管开大送风机风门,送风量还远远不够,风压一直提不上来,追其原因发现预热器管严重腐蚀、穿孔,导致漏风增大。腐蚀的原因是因为结露造成的,实践证明预热器管不到六年就得更换,损失很大,直接影响到热电联合车间的经济效益。针对这一问题,本文重点分析一下低温腐蚀产生的原因。实测到了锅炉的酸露点,根据近年来的测量结果提出几点防止低温腐蚀的建议。     

化工热侧电除尘器酸露点计算与酸雾控制

化工热侧电除尘器运行过程中存在系列问题,电晕极、集尘极板出现腐蚀变形,除尘效率波动较大.本文通过探讨其影响作用机制,认为其关键在于烟气的酸露点确定,酸雾的控制,只有全面分析沸腾炉烟气酸露点,酸雾的成因及变化规律,采取针对性的措施,才能保证电除尘器的高效运行.     

基于温湿度测量的露点仪设计与应用

针对当前测量露点的仪器价格昂贵、结构复杂以致无法在实践教学中广泛使用的现状,该文提出了一种基于温湿度测量的露点仪设计方法.文中给出了详细的硬件设计原理图,介绍了温湿度传感器数据获取,数据转换等具体的软件设计方法.本文对仪器做了实际测试,对数据结果进行了简要分析,结果表明该露点仪性能稳定,数据可靠,可满足实践教学的需要.     

S－TEN3和CRIA系列钢的耐硫酸露点腐蚀性能

通过浸泡实验测出了Ｓ－ＴＥＮ３、ＣＲＩＡ两类钢种在各种硫酸介质中的腐蚀速率。结果表明，Ｓｂ和Ｔｉ分别能显著改善Ｓ－ＴＥＮ３和ＣＲＩＡ钢的耐硫酸露点腐蚀性能。在此基础上，探讨了合金元素在腐蚀过程中的作用。     

Shaw露点仪的应用及维护保养

本文介绍了Shaw露点仪的工作原理、应用及日常维护经验,结合在分析公司各种气体中微量水的实际应用,对其使用方法、操作步骤及维护保养进行探讨。     

不同e_a计算方法对Penman-Monteith公式的影响

实际水汽压ea是Penman-Monteith公式中计算参考作物蒸发蒸腾量的重要过程参数.为了研究在湿度缺测条件下,露点温度法替代相对湿度法计算ea在我国长江三角洲地区的适用性,选用江苏南通2000~2004年的旬气象资料,采用FAO推荐的相对湿度法和露点温度法两种方法计算了实际水汽压ea和旬参考作物蒸发蒸腾量ET0,分析了这两种方法计算结果的误差及其与影响因素间的关系.结果表明:这两种方法计算结果间误差较小,有98%以上的计算结果其误差小于20%;实际水汽压间的误差差异与最高最低温差相关关系最强,旬参考作物蒸发蒸腾量间的误差差异与最低温度的相关性最强;在湿度缺测条件下,可以采用露点温度法替代相对湿度法计算ea并进一步计算ET0.     

不同eα计算方法对Penman-Monteith公式的影响

实际水汽压eα是Penman—Monteith公式中计算参考作物蒸发蒸腾量的重要过程参数．为了研究在湿度缺测条件下，露点温度法替代相对湿度法计算eα在我国长江三角洲地区的适用性，选用江苏南通2000-2004年的旬气象资料，采用FAO推荐的相对湿度法和露点温度法两种方法计算了实际水汽压ea和旬参考作物蒸发蒸腾量E710，分析了这两种方法计算结果的误差及其与影响因素间的关系．结果表明：这两种方法计算结果间误差较小，有98％以上的计算结果其误差小于20％；实际水汽压间的误差差异与最高最低温差相关关系最强，旬参考作物蒸发蒸腾量间的误差差异与最低温度的相关性最强；在湿度缺测条件下，可以采用露点温度法替代相对湿度法计算eα并进一步计算ET0．     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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